Cal Output And Ref Level Cal Adjustments - HP 8559A Operation And Service Manual

MODEL 8559A
5-29. CAL OUTPUT AND REF LEVEL CAL ADJUSTMENTS (Cont'd)
PROCEDURE:
CAL OUTPUT Adjustment
1. Allow one-half hour warmup time of equipment with spectrum analyzer connected to mainframe with
extender cable.
2. Connect power meter/power sensor to front-panel CAL OUTPUT connector as shown in Figure 5-20.
3. Place spectrum analyzer on its right side. Adjust A10R13 CAL AMPL for power meter indication of
10.0 dBm 0.1 dB. A10R13 is accessed through motherboard.
-
4. Disconnect power meter/power sensor and connect frequency counter to CAL OUTPUT connector.
Adjust A10C46 CAL FREQ for frequency counter indication of 35.00 MHz
5 .
accessed through motherboard.
6. Repeat steps 2 through 5 until CAL OUTPUT signal is properly adjusted for both amplitude and fre-
quency.
7. Connect CAL OUTPUT to analyzer INPUT.
8. If not already removed, remove CAUTION label (PC Board) from A12 Step Gain.
9. Set spectrum analyzer controls as follows:
INPUT ATTEN
RESOLUTIONBW
TRIGGER
10. Center 35 MHz calibration signal on CRT using TUNING controls.
11. Adjust front-panel REF LEVEL CAL fully counterclockwise.
12. Change Amplitude Scale to 1 dB/DIV and adjust REF LEVEL FINE if necessary to place signal peak on
first horizontal graticule line above bottom reference line of CRT
13. Adjust front-panel REF LEVEL CAL to raise signal peak three divisions (3 dB) on CRT (to fourth
graticule line above bottom reference line on CRT).
14. Change Amplitude Scale to 10 dB/DIV, REF LEVEL dBm to
ADJUSTMENTS
........................................................
...............................................................
..........................................................
.........................................................
..................................................
0.01 MHz. A10C46 is
10, and set REF LEVEL FINE to 0 dBm.
-
ADJUSTMENTS
10 dB
AUTO